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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0d57a78c6114694cf83f22c0348fb630e36d53cc2dfb31ada9e9dc3e08facd' 
  AND token = 'sb3KsXE4R6MifAsAMt0idyQ7MqE11MR8izmdPx+fFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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