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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df14d5d2b1c1b7c01c4a4bc67d21c1e06c358bcadb9717ee70dbfe6c433323d' 
  AND token = 'yKwcbcr2vxUsVKVmc6LBsPeuaodnvjySve38UHhdcq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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