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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94ef3e118025b077e84abdc083af00a5cb68a44b7eb9abccf6e6b0d657ed33d' 
  AND token = 'jmMTydLP/xqBuEESNPLV/Nd7sKQW5hHg2eegyS34NNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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