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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85425dfe23e9fa014fd9ff800de89f83fb589cc7714cbfec55cda166ba1ea434' 
  AND token = '+/r2Qx4EewhuLIQsvEE07/KLQ7ceQ/ZzsU4ihLu9YHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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