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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de1e4e3550106da622402b6c18157edea60207b769ea2d0adf813689ffa65ea' 
  AND token = 'PgxZ2GTUptDg/yIz+6cS62nRZCL+PsCFh45k8sufR38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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