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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a26927c303ae769fee41ab8995fac1ecfe59887c10ffb0b33c5fae5920c5e1' 
  AND token = 'FgO4jbavjyKZEMFX96DEp0jeTTAcC4j0+1TQxN8NGi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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