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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b12d44826034c822b67e094a8756484d11078381b3bd20f4305bdc26fd087db' 
  AND token = 'mlZImB37aDamPHC8eTyZSCAFzv23Y1ouRUEaqAuEEO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}