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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e3c23b53834bd773e21b936e158a6040ecadb53f9b2f3f632f4382115ae9fe' 
  AND token = 'bKZlIOrPZIeH1XlpTQng/d0t/7LCKh4JFVRzOJ5TuI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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