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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d339f6db88e14402094c61771701136b9b296cc000a966126adabfa0988b1cd' 
  AND token = 'QwmaEW3wp5GH7AsGK77ssUQN4j5wV3YYGL/5hnETFok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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