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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7a1724f8e9820f27e4325b7103f88981844e663cbb16a1623deb0e57d9b97d' 
  AND token = '1rU1RpBH6MAIRk6XoF7WA8uwUZXYXXDKy5WbpXteqBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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