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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1fb3619c898a27dc657b166aefdf7720eeaa366cd993b2ed9c3a93d5b557f3' 
  AND token = 'OLeW98gksJr3wVRSXifbFxX6LnWtdNTgOeVgw6fgs/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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