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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874bcdfb892d9a3ecc3aa06a1f047c708a7e8f1ca44bcf10274538cd68573788' 
  AND token = 'mH++W5pc8CDGOVIXzJRwRIcJdg+8YuRg8OezmL7mWYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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