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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26935d2b19298061831a125e1d37b0a3cdcfb7e557bb1241fbf8d0b13428fdd' 
  AND token = '6d+f59OqMO3vvt11FUa+vUSKufS6O9Iiar5zhL7AA+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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