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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860f2d658d237fcf73e9b95b925d7c3a6c8bf5c9c9a8269f9dd3811f85aaedce' 
  AND token = 'uKKkX0PcCkpvu3HYnV1vfxwZNI6MyfV2bYcmf/kQhQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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