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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf2a58b92311c8e761f8854f960b76d20aed8014f51616cb9286513170121b9' 
  AND token = 'mGNte3y0+z/LiSWrn8LAKk8CIzUr56aNUbpfg4dh4yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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