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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5a53943a819e43814b166c5697d25c1dd70f5ab9a32196c93ce53ed7c257bc' 
  AND token = 'sWaRY90bqEoRMU6Loo6E2tN8bvwgv3GVR5aKGDlQrm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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