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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f552eaa20115363080ff70e543dcab2fb87b239e6fd15819c74826b0d27b47' 
  AND token = 'w/xyDxfYHmov/3AG6iA2T8A8Cqg0TRq8g7pBc6Fm7kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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