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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4468b32c8447327420ea600583a56dbf4348371ac129a4b315c1063d45ac84ce' 
  AND token = 'ilxv6lscQTDSPbMG5kLGIaWp3smtKSXy35n9SGQD+a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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