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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5327adb32e8203f92498956a6971baa313e300a1fe0f86397e3a0311323003' 
  AND token = 'GatYgTVMH7q+u/FrjYXa1063NodKy5w3CMlnzHdoeYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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