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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc444fd6d1c536754fc5c2ae2cf2a50f728ac358043c5b6c5cca7efb7f999a80' 
  AND token = 'xGhWe/PA+9+3WNQCCikymApKq8RJEsiTXSCTcqILe5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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