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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60a1ef592ec247a580f7d2a7ed7f0d9c5521cfdbc5395c37748ffb8869d1304' 
  AND token = 'XBIkbH6e7aLRikL6Mu+lUupTFT6lRoc3xAw2bBsI/Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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