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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c8f6a15a27c2949f62b0150065f262e38196fc8c0ffa4e460772d58f4766c4' 
  AND token = 'YixJOklX4iWNH2s1QZh8Wm2ytOwJ/0T4ooRa325Y444=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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