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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8ed49295d0fd301723f6827a4e605890756f93da539cec930e856558cf1c9e' 
  AND token = 'iV1aFH58DruX9KiWNoQIyu3FZKm7SK61Buonx3mjYsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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