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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3cd241b6827664e7277402a58d04f2391edb45b57523ce9884285a8e8585fd' 
  AND token = 'cVvUIMFc8GgNCnOKWkygsz0hEu1sAsZe9MEnfcxGFrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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