SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdb3342aa1736789e385c2b5c2b17f555c9d1a701a47278a15d4268e4cbf37e' 
  AND token = 'UnK9RS56bJGhLTPqusVhBfzk8O/EKi3pGcfdaRBmFZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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