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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60c79014a45f7ebd1d86414e64d33b045d2c930601d93ddd2c94440278d6c73' 
  AND token = 'gUfR31p4GCET1qi9w9pcZAXJbDxjKWlu8xUUdn0KeJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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