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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490445ba7069fb04dc68f3b5237a9dcaf6664c495c2dd8d0cd100e372c8a8a5a' 
  AND token = 'sCqUEWdFgES3icQWWyclb/7qekHtx/yzi5aIu50CpD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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