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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8519306cbd6393bbd1041f4caa612b9f7cb7832d3bfae5fa38748079bf2793' 
  AND token = '1rTt/AF6AH4SO+411/C+x/KpXjXKbFPJ7WrAREmMyOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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