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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6eec79b48256f4689298c4b0eb904c244ebc5862bbfee1841845139fd9d2bc6' 
  AND token = 'yo9NiLOPaI2YTRw4W7PxXskzoZRXingT4ZtK0WceLFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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