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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b268d760bbd83eb8aa44402f4bd0c77c149aa7286b9b1ab503b94030d1cb44a6' 
  AND token = 'vhX7l13WGIgaYiFaBXMPNaL9tt69Lz6x5zzSwhKxiEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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