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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07a1f5cae4ce7eb1e93b3ce48009cdde893cee76a87fb42f2dfdd603dc037e0' 
  AND token = 'bKo3UoyepVhCupfOweyUQGhSWToufZD+KFzOL4BNUfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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