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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af61ee88628ad7dce2f3761ee42dc300ed1ae224a1125b9dedadf5b2341e84e2' 
  AND token = 'xi9cMthTN04nW5qlVKplIeasMNVeEprGzfdTlJcLyzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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