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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30b8ec2d62e7d397bbe3fbf0a87740f28ac544fab0865e5d26f6ecaa9b0bd6a' 
  AND token = 'SQv8tPTcqUMo00UFUXOrveS0PnPNuUOL52/d7ZHjB40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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