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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e8d0d795c1ea4f8ea4f6ee39836efbd03324c93a3a0a10574f526e027cc435' 
  AND token = 'LJUQbAMEwAe8LyKUEIxLIgbWo0V6dBwEbpNY4/P2vjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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