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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55cfe2ad797cb4899eaffeac5d3ab0a23328baffac78632633f3aa49b9c4306' 
  AND token = 't88mYHwKX+Tjg40vv2kVTL+kYDWSd93bRo7kjRENTjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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