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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89e816c79ce136d2814d090ece9fdddd400f4e0f2b78a70cfd5913891abb45f' 
  AND token = 'hDNpEKh9KX/xp9+dJuR+myDeMVujJ1r5nl8XBIGRHIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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