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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af7e32045f109c0d8e9bc1875c0f0767d4ae9530c8e9468f9b4fdd22495455e' 
  AND token = 'SYn4KetbpJ4N6vv4P8rKiY50tHXKeR8gHP1YJXPW8Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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