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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd935a03af0b4a88e3b03a40435609c4a22a407c2995a0f3185a82e1f080ccdf1' 
  AND token = 'xJ0zOHNpMqZLGoB3maQHhWKOzboQXmgA4M1FlKye2ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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