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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56fe1955b1cb53d92e2c89daff0c94aa795559579e91a35e13bb0682aeb86cb' 
  AND token = 'adBnkDkdP+kFSzge+K1+ZdWEIgDPJ9DDdXK2fYk06n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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