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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fe26e650808308e5a711e1d4607cefb32346a66528eb89363767bf66c52746a' 
  AND token = 'q2/X0UFs720tVjT6hClaTUKvz/zZU6KieIYXIXc+ubA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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