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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e7a9fcd16f09235ff8367b48fadbcb98d8b6cbb985e7606e868da7c66bd4e2' 
  AND token = '31YJwUds8eNDhFb/8jItG9a9EGXHFFaETy9iG+YFOpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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