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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86b75661796db211802c8fc82890387c9898800d8bc3a3073781a6fabbd86eb' 
  AND token = 'DCxUycKKza51xD5m0ixtDzkTPxdj8mMEXhziLrpp04I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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