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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1683f15c6e4dc32fccee8aa1c0f6e9b01306672b1c9ae3fed1a152a7b619c5c' 
  AND token = 'slBIkNEqz7gwfSFFu/IdMxDjvrwsGkYcUw6sQwH4EBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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