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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f9e768da181faaaf03bf6fb377cdc73b49bb8fb19c83a2c174fccfcf1d366a' 
  AND token = '33FWrWeBzf6QxXm+Gm5bPPg5wDnlhe0bilohVXipTZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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