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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffef0ec0549dbcae247cd97fae5c0d79321f06bfaa94b3fd5929774f28a258e' 
  AND token = '1hG/AhoM68F/5rCPE5FfxWhT5re/6Gp+bwx4gDwRRxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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