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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88a6ac2f035c96982a6d392043bf050f67595a3d5f4b4ed21e51e5d976c2abe' 
  AND token = 'b3mkbqvy1Bsal1dZIttJiJJnuOBQXZINB55axrjiAEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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