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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e947c435e85aed9d63cdf6f5f4da9d63d3ccfbfc4083fa32957b407b52c16ef8' 
  AND token = 'BVmBRw4yOQd53b4lFKovAyHqCANRa9IA3/deTl3FyRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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