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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26461ebd241629b453949eaf3194c2f43ed71a7796a814663bcb8b858ba5591b' 
  AND token = 'nu70YIXtV16Fmkl5u4MZeOljUTckDVwHDlrVGWbwkhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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