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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd560d6cf1c936f1b38e0da0773f1866a72022854813e00f93a2ba9dd8acb043' 
  AND token = 'qexH8fuTeBa+gX7jNe7JjCm+I3a/O17DSVgwWB4E958=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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