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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868200538a9f8dff93ff2be3c9c7ec4680860a9cf5c69545ca75c8176fecdf5a' 
  AND token = 'dherfiXU+zkBUwA+Q0pcbMr4myuNFv6IrtP8iu9xbwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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