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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9caa51b9fed3875f34a205c5cde1b3f6cfd9b7858dcd747d0a72280b9b3d1c07' 
  AND token = '2atx95qspu5T/t8yvnJ55Uux2VxrGUTlQ8lW5mju9/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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