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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47da90c36469027c70358da7fff3279e07504fca407f8b4e21dc40cdce8c16c3' 
  AND token = 'MLusKGGB/vXEU97/PKvbShKZKHS5F4RXp7AbWrAmhR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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