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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27684fb3d3ad70440789a8f2a662f2d74352627573d60057d873ca921b50429e' 
  AND token = 'kUp2jRL9koeIEwdsyhEbJBie9K+2uHj9Ose7EKE0rqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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