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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ada881b21cd7c005c0c328622ca4a6ea4b48a1d2d29d68d23f786b7804ee61' 
  AND token = 'N0BYy3R+7HOOvPyj2fPBISxx1h+YMy76fdxxJ9WHsAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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