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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe60d49523e99b39d2a92cd3e1a6c7728af353fd84697abf061291860aebc734' 
  AND token = 'qUBsBruvF2Cc5+5pMIZLEHNLBIHys3nyfmDj0nxt34c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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