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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee838d4abff7222fe3881856bf1813b63b20ec23db672d9c7bd92c7c4bffbf6b' 
  AND token = 'zZcgVTqs6laglKxVOgZa3YUc4tUgNS2k8s5/LbDNFrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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