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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97349fbe82baae3dadcdb0d5539315636241b130f6d7c836b23edd2c5f61ebc5' 
  AND token = 'wbe9ld68yx8juzFjDSaAfIGFfSkrwe958CPx13SvThM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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