SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cd847d1891684596e9b074493c77324a0b39c94de2dbecd367a15fffb26c72' 
  AND token = 'pkCjDhwIc/TZRJSlBgOmRvoSr+L9i9er4vp+eE+JGko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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