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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9302f21955c55130c9e3ad273bca27f81ae46108caef612c7bda13232932ea9' 
  AND token = 'OOUT5ubYi6FxSm0auZdV5qldA3b7MvFy3Sm+mJmaO6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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