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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7494d91930ed1482871b86ebcaa68d29f4113eea348b9094e7bac7bd89b2c82a' 
  AND token = 'Fl8fTqGnzVe5aDCiwDoWKz9EesdBWrWJIHuQ8S4TJKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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