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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0c5636d5610ceb10f2a5261db9a30ad2f73b1afdedef53c89a63c0521f54db' 
  AND token = 'XUqdVNyB/fru15FCyjKM9lLQIukrnCi3QPipvVq9Ewo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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