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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bafd499401eece53e35adc1f3d8152dd993c5596a8b287c0b73f66ab5b2ebf' 
  AND token = 'MfEJUxrouAtkQso7g9mGD02wQ3j34vG+Tj4QUMf+Mps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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