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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f327199393fc53a6f5de2cb2c7088401e41789550df1d4ffa40bcc2e7b29c4' 
  AND token = 'xcHqlhmeqkf8jnHF4hLxmj4LBFK7ALTkHEKsdSwjYGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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