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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ebe90efa808f20f53b8f38f4c8bb04da1bd95838cd549c27cce6531f30f532' 
  AND token = 'BUs3BLL8Wn+yI2S0U0jbTQu0WGYJYqbwif9uD6gLXuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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