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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0b2dcf1b9bc69ea3eec89aef0aa2aed0eebd25dc9e836fd7d2fba8d61ca8d4' 
  AND token = '66Gn4rRpbXeNi2BtPYVjccpu7EgN71yek4dm7Pol75Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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