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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b171bf88c07fb8efdf342cb29e1a4bb5c7774244de3fae45deae39b74c99583e' 
  AND token = '+Z95I+TciiDvEz7oYcPmGLmiCP69dicUwSLL8PeBf3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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